female goose with her feathers missing/pecked

I have two female geese and one male, but my male has the two girls feathers on the back of their necks gone, some on their back gone, and one goose even has a couple of her wing feathers that have been pecked at due to mating, so I was wondering if there is anything I can do to repair their feathers and get them back into good shape? He is really rough on them and now that they're about done laying eggs I have been separating my girls from him during the day to give them a break, but is there anything I can do to help them out? Anything I can put on them where their feathers are missing/pecked at or anything supplemental they can eat to help their feathers?